RESUMO
In this study the SEM was used to measure the axial and marginal gap distance and to declare the marginal openings and faulty castings of three different ceramometal alloys a precious, semi-precious and nonprecious alloy systems that are commercially used in crown and bridge prosthodontics and to make a comparison between them in regard to axial and marginal gap distance.
Assuntos
Adaptação Marginal Dentária , Ligas Metalo-Cerâmicas , Ligas de Cromo , Coroas , Técnica de Fundição Odontológica/estatística & dados numéricos , Prótese Parcial , Ligas de Ouro , Humanos , Microscopia Eletrônica de Varredura , Paládio , Platina , PrataRESUMO
Sandblasted surfaces of a beryllium-free, nickel-chromium alloy were bonded with one of three chemical adhesives. After either immersion in water for up to 6 months or thermal cycling between 5 degrees and 60 degrees C for 500 cycles, the bonded specimens were tested for both shear and tensile strength. The highest values of tensile and shear bond strengths were found with Panavia Ex material, and these values showed no significant changes after thermal cycling. For ABC cement and for Super-Bond C & B material, the strength of the bond was significantly improved with thermal cycling. However, immersion in water for 6 months caused a significant decrease in the strength of the bond of specimens adhered with ABC cement.
